A heart does 1.5 J of work in each heart beat. How many times per minute does it beat if it's power is 2 watts.

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Solution

The power, the work done and the time is related as,
$P = \frac{W}{t}$
So, the total work done by the heart in one minute will be,
$W = P \times t$
Thus, on substituting the values we get,
$W = (2 W a t t) \times (60 s) W = 120 J o u l e$
Thus, the total work done by the heart in 60 sec is $W = 120 J$
Now, the number of heart beats per minute will be calculated as,
$N o . o f h e a r t b e a t p e r m i n u t e = \frac{T o t a l w o r k d o n e}{W o r k d o n e i n e a c h b e a t}$
On substituting the values we get,
$N o . o f h e a r t b e a t p e r m i n u t e = \frac{120 J}{1.5 J} N o . o f h e a r t b e a t p e r m i n u t e = 80 t i m e s$

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